It was built by the Normans in 1088, unusually with two mottes on closely adjacent hillocks linked by ramparts and ditches and overlooking the River Conwy. It was captured by the Welsh in 1200 and 1231 but retaken both times and rebuilt in stone in the 1240's when the towers, one on each hill, and the twin towered gateway were added. It was captured again by the Welsh under Llywelyn the Last and totally destroyed in 1257. Only traces of the structure can now be seen.